package com.perstorp.cykelapp;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;

public class SQLDatabase extends SQLiteOpenHelper {

	private static final String TABLE_PROFILE = "profile";
	private static final String KEY_WEIGHT = "weight";
	private static final String KEY_LENGTH = "length";
	private static final String KEY_AGE = "age";
	private static final String KEY_GENDER = "gender";
	private static final String KEY_ID = "_id";

	// The Android's default system path of your application database.
	private static String DB_PATH = "/data/data/com.perstorp.cykelapp/databases/";

	private static String DB_NAME = "database_profilesAndActivities";

	private SQLiteDatabase myDataBase;

	private final Context myContext;

	/**
	 * Constructor Takes and keeps a reference of the passed context in order to
	 * access to the application assets and resources.
	 * 
	 * @param context
	 */
	public SQLDatabase(Context context) {
		super(context, DB_NAME, null, 1);
		this.myContext = context;
	}

	/**
	 * Creates a empty database on the system and rewrites it with your own
	 * database.
	 * */
	public void createDataBase() throws IOException {

		boolean dbExist = checkDataBase();

		if (dbExist) {
			// do nothing - database already exist
		} else {

			// By calling this method and empty database will be created into
			// the default system path
			// of your application so we are gonna be able to overwrite that
			// database with our database.
			this.getReadableDatabase();

			try {

				copyDataBase();

			} catch (IOException e) {

				throw new Error("Error copying database");

			}
		}

	}

	/**
	 * Check if the database already exist to avoid re-copying the file each
	 * time you open the application.
	 * 
	 * @return true if it exists, false if it doesn't
	 */
	private boolean checkDataBase() {

		SQLiteDatabase checkDB = null;

		try {
			String myPath = DB_PATH + DB_NAME;
			checkDB = SQLiteDatabase.openDatabase(myPath, null,
					SQLiteDatabase.OPEN_READONLY);

		} catch (SQLiteException e) {

			// database does't exist yet.

		}

		if (checkDB != null) {

			checkDB.close();

		}

		return checkDB != null ? true : false;
	}

	/**
	 * Copies your database from your local assets-folder to the just created
	 * empty database in the system folder, from where it can be accessed and
	 * handled. This is done by transfering bytestream.
	 * */
	private void copyDataBase() throws IOException {

		// Open your local db as the input stream
		InputStream myInput = myContext.getAssets().open(DB_NAME);

		// Path to the just created empty db
		String outFileName = DB_PATH + DB_NAME;

		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);

		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}

		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();

	}

	public void openDataBase() throws SQLException {

		// Open the database
		String myPath = DB_PATH + DB_NAME;
		myDataBase = SQLiteDatabase.openDatabase(myPath, null,
				SQLiteDatabase.OPEN_READONLY);

	}

	@Override
	public synchronized void close() {

		if (myDataBase != null)
			myDataBase.close();

		super.close();

	}

	@Override
	public void onCreate(SQLiteDatabase db) {

	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

	}

	public String[] getProfile() {
		int[] iProfile = { 0, 0, 0, 0 };
		String[] sProfile = { "", "", "", "", "" };

		// 1. build the query
		String query = "SELECT  * FROM " + TABLE_PROFILE;
		
		// 2. get reference to writable DB
		SQLiteDatabase db = getWritableDatabase();
		
		Cursor cursor = db.rawQuery(query, null);

		// 3. go over each row, build book and add it to list
		
		if (cursor.moveToFirst()) {
			iProfile[0] = Integer.parseInt((cursor.getString(0)));
			iProfile[1] = Integer.parseInt((cursor.getString(1)));
			iProfile[2] = Integer.parseInt((cursor.getString(2)));
			iProfile[3] = Integer.parseInt((cursor.getString(3)));
			sProfile[4] = (cursor.getString(4));
		}
		for (int i = 0; i < 4; i++) {
			sProfile[i] = Integer.toString(iProfile[i]);
		}

		db.close();
		
		return sProfile;
	}

	public void updateProfile(int weight, int length, int age, String gender) {
		// 1. get reference to writable DB
		SQLiteDatabase db = this.getWritableDatabase();

		// 2. create ContentValues to add key "column"/value
		ContentValues values = new ContentValues();
		values.put(KEY_WEIGHT, weight); // get weight
		values.put(KEY_LENGTH, length); // get length
		values.put(KEY_AGE, age); // get age
		values.put(KEY_GENDER, gender); // get gender

		// 3. updating row
		db.update(TABLE_PROFILE, // table
				values, // column/value
				KEY_ID + " = 1", // selections
				null); // selection args

		// 4. close
		db.close();
	}
}
